Area Forecast Discussion
Issued by NWS Boise, ID

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FXUS65 KBOI 230915

Area Forecast Discussion
National Weather Service Boise ID
315 AM MDT Fri Mar 23 2018

.SHORT TERM...Today through Saturday...A drier and colder air mass
has filtered into the region behind Thursday`s strong cold front.
More than 50 cloud-to-ground lightning strikes occurred with the
front`s passage, with many striking the Lower Treasure Valley.
The associated upper level trough, anchored offshore, will send a
shortwave trough inland across southeast Oregon Friday night, and
southwest Idaho Saturday morning; this will bring a chance of
rain and snow showers and a brisk southwesterly wind across
southeast Oregon and along the NV-ID border. Snow levels will vary
between about 3000-4500 feet Friday. Behind the shortwave trough and
its associated cold front, snow levels will drop to valley floors
for a cooler than normal Saturday; temperatures will drop to
about 10 degrees below the norm. Snow showers will bring about
1-3 inches of accumulation to the higher elevations late Friday
and Saturday; valleys will see little to no accumulation.

.LONG TERM...Saturday night through Friday...An upper level
trough will move onshore into the PacNW Saturday night, and cross
the area Sunday into Sunday evening, spreading snow showers as it
moves through. Residual moisture will result in mountain showers
again Monday. Ridging will build in behind the trough, with just
enough moisture reaching the West Central Mountains to maintain a
slight chance of showers there Tuesday and Wednesday. We expect
Thursday to be dry. By late Friday, moisture returning on
northwest flow aloft warrants a slight chance of showers in the
mountains once again. Temps will start out around 10 degrees below
normal Sunday and Monday. As the ridge moves in, readings will
rise to near normal Wednesday, and become slightly above-normal
Thursday and Friday.


.AVIATION...Mostly VFR, with MVFR showers possible KBNO/KBKE/KMYL
today and tonight. Surface winds: generally south 5 to 15 kts,
except southwest and increasing to 15 to 20 kts over southeast
Oregon this afternoon. Winds aloft at 10k ft MSL: southwest 15 to 30

Weekend Outlook...Generally VFR, but MVFR snow showers are possible
each day as an upper level trough moves through the area. Surface
winds: generally west 5 to 15 kts. Winds aloft at 10k ft MSL:
southwest Saturday becoming northwest Sunday, 15 to 30 kts.





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